Key result
Prior movement history alters muscle spindle receptor responses via cross-bridge kinetics, promoting muscular stiffness regulation.
The integration of mechanical properties of muscle and spindle receptor promotes stiffness regulation via cross-bridge mechanisms.
Animal data on spindle-mediated stiffness; leaves open human translation and clinical relevance.
The effects of prior movement on the force responses of skeletal muscle are compared with the effects of movement history on the changes in firing rate of muscle spindle receptors. Prior release results in the linearization of the mechanical properties of skeletal muscles, which can be provisionally explained by cross-bridge models of muscular contraction. The history-dependence of responses of muscle spindle receptors in unanesthetized decerebrate preparations appears to result from the kinetics of cycling and noncycling cross-bridges. The results of this comparison indicate that the integration of mechanical properties of muscle and spindle receptor promotes stiffness regulation.
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Nichols et al. (2004) studied Muscle spindle and stretch reflex physiology. Prior movement / movement history was evaluated on Force responses of skeletal muscle and firing rate of muscle spindle receptors. Prior movement history alters muscle spindle receptor responses via cross-bridge kinetics, promoting muscular stiffness regulation.
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